In the nice streets, go to the left just past Koko the Mime, and look on the ground near the first big bush, there looks like a magazine on the ground. Hit the action button, and you get 10 tokens.
In Crappy streets, go to the corner at the bottom of the staircase near Sweetwater the Pimp. You get Judd Nelson's Phone Number. In the alley, you get Rick Allen's arm (isn't he the drummer for Def Leppard? If so, nothing surprises me with the game)
In the art gallery, in the classroom near the sketches. you get money (like $50)
In the main campus, near the bulletin board where the soccer ball is, go in the little niche, and there's a mark there. 5 secret tokens.
In the library, immediately to the right as you enter the door. You get the wings of Hermes.
In the sorority house, the door with no name tag (the "?" above it as you approach, 5 secret tokens).